Abstract
A binned Dalitz plot analysis of B± → DK± decays, with D → K0Sπ+π− and D → K0SK+K−, is performed to measure the CP -violating observables x± and y±, which are sensitive to the Cabibbo-Kobayashi-Maskawa angle γ. The analysis exploits a sample of proton-proton collision data corresponding to 3.0 fb−1 collected by the LHCb experiment. Measurements from CLEO-c of the variation of the strong-interaction phase of the D decay over the Dalitz plot are used as inputs. The values of the parameters are found to be x+ = (−7.7±2.4±1.0±0.4) × 10−2, x− = (2.5±2.5±1.0±0.5) × 10−2, y+ = (−2.2±2.5±0.4±1.0) × 10−2, and y− = (7.5±2.9± 0.5±1.4) × 10−2. The first, second, and third uncertainties are the statistical, the experimental systematic, and that associated with the precision of the strong-phase parameters. These are the most precise measurements of these observables and correspond to γ = (62+15−14)◦, with a second solution at γ → γ + 180◦, and rB = 0.080+0.019−0.021, where rB is the ratio between the suppressed and favoured B decay amplitudes.
Original language | English |
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Article number | 97 |
Number of pages | 31 |
Journal | Journal of High Energy Physics |
Volume | 2014 |
Issue number | 10 |
DOIs | |
Publication status | Published - 16 Oct 2014 |
Keywords
- B physics
- CKM angle gamma
- CP violation
- Flavor physics
- Hadron-Hadron Scattering
ASJC Scopus subject areas
- Nuclear and High Energy Physics